MacHeist 3 Bundle – charity math

I bought the MacHeist 3 Bundle for US$39. I like some of the applications (Picturesque, SousChef, World of Goo(!!)) . I started to wonder about the math they about the 25% they want to give to charity. So, the following image: shows that 31,712 bundles sold. So, 31712 bundles * US$39 * 25% gives the result US$309,192. But the image shows only US$295,785. Why is there missing US$13,387?

I don’t want to start a conspiracy here… is there a bug on the counter?